linux-kernel - Re: Fix PCI in Holly device tree

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Message-ID: <20080925122241.GC2243@yoda.jdub.homelinux.org>
Date:	Thu, 25 Sep 2008 08:22:41 -0400
From:	Josh Boyer <jwboyer@...ux.vnet.ibm.com>
To:	paulus@...ba.org
Cc:	David Gibson <david@...son.dropbear.id.au>,
	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org
Subject: Re: Fix PCI in Holly device tree

On Thu, Sep 25, 2008 at 08:11:29AM -0400, Josh Boyer wrote:
>On Thu, 25 Sep 2008 12:39:04 +1000
>David Gibson <david@...son.dropbear.id.au> wrote:
>
>> The PCI bridge on the Holly board is current incorrectly represented
>> in the device tree.  The current device tree node for the PCI bridge
>> sits under the tsi-bridge node.  That's not obviously wrong, but the
>> PCI bridge translated some PCI spaces into CPU address ranges which
>> were not translated by the tsi-bridge node.
>> 
>> We used to get away with this problem because the PCI bridge discovery
>> code was also buggy, assuming incorrectly that PCI host bridge nodes
>> were always directly under the root bus and treating the translated
>> addresses as raw CPU addresses, rather than parent bus addresses.
>> This has since been fixed, breaking Holly.
>> 
>> This could be fixed by adding extra translations to the tsi-bridge
>> node, but this patch instead moves the Holly PCI bridge out of the
>> tsi-bridge node to the root bus.  This makes the tsi-bridge node
>> represent only the built-in IO devices in the bridge, with a
>> more-or-less contiguous address range.  This is the same convention
>> used on Freescale SoC chips, where the "soc" node represents only the
>> IMMR region, and the PCI and other bus bridges are separate nodes
>> under the root bus.
>> 
>> Signed-off-by: David Gibson <david@...son.dropbear.id.au>
>
>Acked-by: Josh Boyer <jwboyer@...ux.vnet.ibm.com>
>
>Paul, I can include this in my 'next' branch if you aren't opposed.
>I'll have another set of patches going in there today/tomorrow.

Er... on second thought, this actually fixes a regression on Holly.  So
I'll amend my offer to put it in my 'next' branch to be contingent on you
not wanting to get it into 2.6.27 this late.

josh
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